In order to make life more comfortable, sophisticated technological advancements are taking place all the time and in everything – right from home appliances to electronic gadgets and more. For example, Air Conditioners (ACs) which were used earlier did not possess sound dampening technology and energy consumption was very high. Today in most of the air conditioners we can observe sound dampening technology and two-stage compressors that reduce ac noise level and makes air conditioner almost noise free. However, after long usage, you can hear some unusual sounds from your ac unit. If the sound is above 55 decibels indicates that your AC needs repair or other AC maintenance services. There are different types of AC noises and each noise is a symptom for a specific issue. If you ignore these AC noises they may turn the initially minor issues into costly repairs. Let’s explore the 8 common ac noises and what do they mean.